Not the first founded on paper

Hello everybody.
I'm reading 'Little Women' by Louisa May Alcott chapter 27.

she was covertly taking down the address of the paper, and boldly resolving to try for the hundred-dollar prize offered in its columns for a sensational story. By the time the lecture ended and the audience awoke, she had built up a splendid fortune for herself (not the first founded on paper),

I'm completely mixed up with the bold part Would you please tell me what it implies?

What I got is Jo had provided herself with a good chance, but the chance is different from her priority to become a good writer and become famous. The chance just help her make some money. Am I right?